IPhone 4s on straight talk mms not working?

I have no idea how to get this working, it has not worked since I have been with straight talk. I have an at&t sim in it, everything else works but mms I can't send or receive pictures. How can I fix this without doing the sim swap?

Added (1). I can't change my apn settings

How to send Itunes credit to someone in a different country?

I'm currently playing a online game on the iphone and a online friend in a different country is willing to buy me on of the in app purchases… My question is is there a way to do this without giving away any more information than my email address?

we thought about using the itunes gift function but that doesn't not work cross different contrary (http://support.apple.com/kb/HT2736?viewlocale=en_US)

the other plan was for him to purchase a NZ itunes card online but all sites i've found ether look dodgy or send the physical card which means ill have to give my home address…

any other plans that will work are welcome, and so are any sites that are safe that can do the above ^.^ and thank you.

How to convert png pictures to jpeg on windows 7?

I emailed pictures off my iPhone to my email and saved them on my computer and now I can't print them on walmart and i'm thinking its because of the reason above. I'm new to the latest version of windows so if someone could help that would be awesome

I would like to get a Iphone 5s on contract but need to find the cheapest one?

Hi, so basically my contract is running out soon and I would like to get an iphone 5s on a new contract, but the ones that I find are way to expensive. I'm willing to pay £27 a month and £190 one off for the phone. So I was wondering if you guys could tell me if you've found anything similar? All answers appreciated thanks XD

How to restore your iPhone to its original state?

So I did something really stupid. I plugged my new phone into my laptop and it automatically backed up my new phone with my old files and I lost everything I had before like contacts, messages etc. Now I want it to go back to its original state where I still have my stuff on it. So help is appreciated!